Re: [racket-users] How do I launch a REPL in the context of a file?

[Alexis King]

> On Nov 30, 2018, at 08:23, Sam Tobin-Hochstadt  wrote:
> 
> I'm not sure why `-e` doesn't evaluate in the same namespace as the
> REPL, but if you put `(enter! "my-file.rkt")` in `enter.rktl` then:

I’m curious about this, too. At first I thought it was just a misfeature, not 
necessarily a bug, but now I’m not so sure. The namespaces are not actually 
separate, as the following interaction demonstrates:

$ racket -ie '(define x 3)'
Welcome to Racket v7.1.0.1.
> x
3

So then what gives? After further experimentation, my running theory is that 
any mutation of `current-namespace` inside of -e is reverted when the REPL 
starts up. You can see this by skipping `enter!` completely and just modifying 
`current-namespace` directly:

$ racket -ie '(define ns (make-base-namespace)) (current-namespace ns)'
Welcome to Racket v7.1.0.1.
> (eq? ns (current-namespace))
#f

I don’t know if this is intentional behavior or just a bug.

Alexis

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[racket-users] How do I launch a REPL in the context of a file?

[Habib Alamin]

Hi,

I'm trying to set up a keybinding in my editor to enter the namespace of my 
current file in a REPL, similar to how Dr Racket's Run button works.

I can do a racket -e '(println "Hello!") -i and it loads the REPL after 
printing Hello. A racket -e '(define a "a") -i also works, in that I'm able 
to access a in the REPL. However, I can't do racket -e '(enter! 
"hello.rkt")' -i. The REPL starts, but I can't access anything defined in 
the file.

After asking in the IRC channel, I was asked to try

racket -e '(let ([racketrc-path (expand-user-path "~/.racketrc")]) (and 
(file-exists? racketrc-path) (load racketrc-path)) (void)) (enter! 
"current-file.rkt") (read-eval-print-loop)

which didn't work either. Neither did

racket -e '(enter! "file.rkt") (read-eval-print-loop)'

I can do a racket -if file.rkt if I get rid of the #lang racket line, but I 
hear using -f isn't good practice, and besides, I want to write valid 
Racket files; removing the #lang line breaks normal Racket operation; I 
can't just do a racket file.rkt.

I'd really appreciate any help in figuring out why this is happening and a 
simple fix.

Cheers,
Habib

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